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March 28, 1933. c. M. F. FRIDEN CALCULATING MACHINE Filed Nov. '7, 1928 2 Sheets-Sheet 1 INVENTOR BY Carl 5:31: fi'lden Ag ATTORNEYS.

March 28, 1933. c. M. F. FR|DEN CALCULATING MACHINE Filed Nov. 7, 1928 2 Sheets-Sheet 2 m mHrmu iiillniiilhil! INVENTOR Car/ M fffi d @i 7 i ATTORNEYS Patented Mar. 28, 19335 1 STATES PATENT OFFICE CARI: M. F. FBIDEN', OF OAKLAND, CALIFORNIA, ASSIGNOR TO MARCHALN'T CALCU- LATING MACHINE COMPANY, OF EMERYVILLE, CALIFORNIA, A CORPORATION OF @ALIFOR CALCULATING MACHINE Application filed November The invention relates to calculating machines and particularly to the operation of control mechanism, which is thrown into operation on the occasion of an overdraft registration in the register.

Calculating machines have been provided with overdraft control mechanism, which is normally disposed in inoperative positlon, such as is disclosed in my co-pending application, Serial N 0. 204,840, filed July 11, 1927, to which reference is hereby made for a disclosure of the various control mechanisms entering into the construction of a calculating machine. In said application, the control mechanism is actuated by a member, which is rotatable with the actuator, and the movement' of the numeral wheels in an overdraft registration serves to move the control mechanism into cooperative relation with *its actuating member, whereby operation of the control mechanism is accomplished. After operation, the control mechanism is moved to inoperative position with respect to its actuator by the pressure of a spring. On occasion, due to increased friction or other causes, the pressure of the spring is not suflicient to return the parts to inoperative position, with the result that inaccuracies in operation occur.

The object of the present invention is to provide means for positively returning the control mechanism to its inoperative position immediately after it has functioned.

The invention possesses other advantageous features, some of which with the foregoing, will be set forth at length in the following description, where I shall outline in full that form of the invention which I have selected for illustration in the drawings accompanying and formingpart of the present specification. In said drawin l have shown one form of mechanism embo ymg the invention, but itis to be understood that I do not limit myself to such form, since the invention, as set forth in the claims, may be embodied in a plurality of forms.

Referring to said drawings:

Figure 1 is a vertical section through a calculating machine embodying my invention,

7, 1928. Serial No. 317,734.

showing the control mechanism and its actuator.

Figure 2 is a detail in plan of the means actuated by an overdraft registration for moving the control mechanism to operative position.

Figure 3 is a detail of the mechanism for positively restoring the control mechanism to inoperative position.

Figure 4: is a rear elevation of the calculating machine, partly in section, showing the control mechanism.

The control mechanism is applied to a motor driven calculating machine and, in accordance with the disclosure in my aforesaid application, serves, in the event of an overdraft registration, to reverse the direction of rotation of the actuator, and stop the actuator at the end of the first reverse cycle. In my co-pending application, Serial N 0. 252,175, filed February 6, 1928, the overdraft control mechanism also serves to cause actuation of the carriage shifting means. The control mechanism disclosed in the present application may be employed for carrying out any or all of the functions of the control mechanism in my two co-pending applications above referred to.

The control mechanism comprises a lever 2, pivoted on the shaft 3, and arranged to be actuated by thecam 4, secured to the shaft 5, of the actuator 6. The upper end of the lever 2, which lies at the side of the cam 4, is provided with a hub 7, in which is seated a movable pin 8, which is normally disposed out of the path of the cam 4, as shown in Figure 4. The pin 8 is provided with a recess containing a spring pressed ball 9, bearin against the internal surface of the hub, to oppose a slight resistance to the movement of the pin, and also to retain it into the position into which it is moved.

The pin is moved to bring its inner end into the path of the cam 4, by the lever 12, pivoted at 13 on the lever 2. The lever 12'is ormally held in inoperative position by the spring 14. At its lower end, the lever 12 is provided with a foot 15, which underlies the arm 16 of the fork 17, which is pivoted to the lever 18, which latter lever is fulcrumed on the shaft 3. The lever 18 is provided on its forward end with a laterally extending foot 21, which lies behind the transfer lever 22, and the adjacent transfer levers. The transfer lever 22 is associated with the numeral wheel 23, and the transfer lever is moved backward on the occasion of an overdraft registration in the numeral wheel 23. Such backward movement of the transfer lever 22 rocks the lever 18 in a counter-clockwise direction, thus depressing)the arm 16 and consequently the foot 15. epression of the foot 15 causes an inward movement of the upper end of the lever 12 which upper end bears against the end of t e pin 8, moving the pin 8 inward to bring the inner end thereof into the path of the cam 4.

Rotation of the actuator, and consequently of the cam 41;, with the pin 8 in operative position causes the lever 2 to be rocked, and this movement of the lever 2 is effective in performing the desired operation; that is, of either stoppingthe actuator, reversing the direction of the actuator, throwing into operation the carriage shifting mechanism, or performing several of these functions. This mechanism, and its operation, is fully disclosed in my co-pending applications above referred to, and, therefore, it is believed to be unnecessary to again describe the construction and mode of operation of the control mechanism herein.

Upon completion of the cycle of operation of the actuator, the restoring cam 25 returns the transfer lever 22 to its forward position, as shown in Figure 1, and the spring 26 (Fig. 2), returns the lever 18 to its normal position.- Pressure thus being relieved from the foot 15, the spring 14 moves the lever 12 to inoperative position. In prior constructions, the lever 12 was connected to the pin 8, so that on movement. of the lever to its inoperative position, the pin was also moved to such inoperative position. It has occurred however in several instances that the spring 14 is" not sufliciently strong to insure the return of the pin 8 to inoperative position, and the present invention contemplates the provision of means for positively moving the pin 8 to inoperative position. In the present disclosure, the positive restoring movement of the pin 8 is accomplished by the cam 27 ,comprising an ear on the cam member 4;, which ear is disposed in a recess in the restoring cam member 25, in order to properly position the cam. The cam 27 is bevelled, so that it operates to restore the pin 8, for rotation of the actuator in either direction. I

In solving a problem in division, the actuator 6 rotates in a counter-clockwise direction. On the overdraft rotation of the actuator, the transfer levers 22 are thrown backward just before the actuator reaches full cycle position, and in time to permit the pin 8 to be ejected in front of the approaching face of the cam 4. The cam is so formed and positioned that the movement thereof from the time of contact with the pin 8 to full cycle position moves the lever 2 sufficiently to operate the reversing gear to cause the actuator to rotate in an additive or clockwise direction. During this rotation, and before the cam 41 can reach the pin 8, the cam 27 restores the pin to its normal inoperative position, so that there is no possibility of the pin remaining in operative position and becoming jammed against the face of the cam when the actuator comes to rest, or in any other manner interferring with the proper operation of the machine.

I claim:

1. In a calculating machine having an overdraft control, an actuating member, stop operating mechanism normally out of operative relation with the actuating member, means controlled by an overdraft registration in the register for positively moving the operating mechanism into operative relation with the actuating member and means for positively removing said stop operating mechanism from said operative relation.

2. In a calculating machine having an overdraft control, an actuating member, means operated by an overdraft registration for positively moving the control mechanism into cooperative relation with the actuating member and means brought into operation after the operation of the control mechanism for positively removing said control mechanism from cooperative relation with the actuating member. 7

3. In a calculating machine having a normally inoperative overdraft control mechanism, a rotatable actuator, means rotatable with the actuator for actuating-the. control mechanism, means operated by an overdraft registration for positively moving the control mechanism into operative relation with its actuating means and means brought into operation by the rotation of the actuator for positively removing the control mechanism from said operative relation.

4. In a calculating machine, a normally inoperative overdraft control mechanism, means for positively moving the control mechanism to operative position, means for actuating the control mechanism and means for postively removing the mechanism from said operative position. v

5. In a calculating machine, a normally inoperative overdraft control mechanism, a cam for actuating said mechanism, means controlled by the numeral wheels in an overdraft registration for moving the control mechanism into cooperative relation with the cam and means movable in time with the cam for positively restoring the control mechanism to inoperative position after actuation thereof by said cam.

6. In a calculating machine, an overdraft control mechanism including a movable connecting member, a rotatable cam arranged to engage said connecting member and actuate said control mechanism, said connecting member being normally in inoperative relation with respect to said cam, means controlled by an overdraft re 'stration for moving said connecting -mem r into operative relation with said cam whereby said control 1 mechanism is actuated and a cam subsequently operative for positively restoring said connecting member to said'inoperative relation.

7. In a calculating machine, a normally inoperative overdraft control mechanism, means controlled by the numeral wheels in an overdraft registration for moving said control mechanism to operative position and a cam for restoring said mechan sm to inoperative position.

8. In a calculating machine having an overdraft control including a connecting member, a rotary actuating member, means operated by an overdraft registration for positively moving the connecting member into cooperative relation with the actuating member, and a cam rotatable with the actuating member arranged to positively move the connecting member out of cooperative relation with the actuating member.

9. In a calculating machine having an overdraft control including a connecting member, a rotary actuating member, comprising a cam, means operated by an over- 3 draft registration for positively moving the connecting member longitudinally into cooperative relation with the cam, rotation of the cam serving to cause transverse movement of the connecting member, and a sec- 0nd cam rotatable with the first cam and arranged to positively move the connecting member longitudinally out of cooperative relation with the first cam.

10. In a calculating machine having differentially operable registering mechanism,

a control mechanism comprising a connecting member settable to a plurality of positions, means for releasably detaining said member in each of said positions, an actuating member, means controlled by the registering mechanism for setting said connecting member into a position to cooperate with said actuating member, and means controlled by said actuating member for resetting said connecting member to a position out of cogperative relation with said actuating mem- In testimony whereof, I have hereunto set my hand.

CARL M. F. FRIDEN. 

